axioms of congruence

In this paper,one host-macroparasite model with impulse and delay is investigated,by using the Fredholm mapping and coincidence degree theorem,the existence of positive periodic solution is obtained.

文章主要研究了一类带脉冲和时滞的宿主—大寄生物模型,利用Fredholm映射以及叠合度定理,获得了该生物模型正周期解的存在性。